KARIMAH, ARMITHA LISANUL (2023) KAJIAN TEKNIS PEMILIHAN FLOCCULANT TERHADAP PENGENDAPAN SLURRY BIJIH EMAS KADAR RENDAH DI PT NUSA HALMAHERA MINERALS. Other thesis, UPN "Veteran" Yogyajarta.
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Abstract
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ABSTRACT
In the processing and extraction of gold at PT Nusa Halmahera Minerals through
the Merrilll Crowe process, several thickeners are required. Thickeners are utilized in
both the pre-leach and counter-current decantation (CCD) processes. To optimize the
performance of the thickeners, the selection of a suitable flocculant is necessary, taking
into account the characteristics of the ore type being processed. This research aims to
analyze the influence of flocculation processes, determination of optimal variations, and
the effect of settling flux on variations in solid percentages, types of flocculants, flocculant
dosages, and ore blending on the settling rate, turbidity, final solid percentage, and
compaction in the thickener at PT Nusa Halmahera Minerals. The benefits of this
research are in the form of recommendations for selecting the Powerfloc flocculant type
with a flocculant dosage of 45 gpt and a solid percentage of 10% for both GY 20% and
GY 40% in the gold ore processing and extraction operations at PT Nusa Halmahera, to
achieve greater optimization.
This study conducted experiments using four types of flocculants. The variations
tested included flocculant dosages of 15 gpt, 30 gpt, and 45 gpt, solid percentage
variations of 13% and 15%, as well as ore blending variations of GY 20% and GY 40%.
The optimization was carried out twice to analyze its effects on settling rate, settling flux,
turbidity, and final percent solid. The first optimization process involved using the best
flocculant and adjusting the pH to a range of 10.10-10.50. In the second optimization, the
percent solid feed was reduced to 10% solid. The research process was conducted for two
hours per batch settling test, with data collected at regular intervals.
The most optimal type of flocculant obtained for GY 20% and GY 40% ore
blending, with solid percentages of 13% and 15%, was Powerfloc. GY20% showed a
higher settling rate compared to GY 40%. As for the flocculant dosage, a significant
increase was observed at a dosage of 45 gpt. Based on the overall analysis of the two
optimization processes, the settling flux that could be applied in the plant for GY 20% ore
blending was 1.19 Ton/m2/h, using Powerfloc at a flocculant dosage of 45 gpt, a
maximum solid feed percentage of 15%, and pH adjustment of 10.10-10.50. For GY 40%,
a settling flux of 1.12 Ton/m2/h was obtained using Powerfloc at a flocculant dosage of
45 gpt, a maximum solid feed percentage of 13%, and pH adjustment of 10.10-10.50.
Keywords: Thickener, Flocculant, Settling Flux.
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ABSTRAK
Dalam pengolahan dan ekstraksi emas di PT Nusa Halmahera Minerals melalui
proses merrill crowe, membutuhkan sejumlah thickener. Thickener digunakan baik pada
proses pre-leach dan counter current decantation (CCD). Untuk mengoptimalkan kinerja
thickener, diperlukan pemilihan flocculant yang cocok menyesuaikan karakteristik dari
jenis ore yang akan diolah. Penelitian ini bertujuan untuk menganalisi pengaruh proses
flokulasi, penentuan variasi yang optimal dan pengaruh settling flux pada variasi persen
solid, jenis flocculant, dosis flocculant dan blending bijih terhadap kecepatan
pengendapan, turbidity, percent solid final dan compaction pada thickener di PT Nusa
Halmahera Minerals. Manfaat dari penelitian ini berupa berupa rekomendasi pemilihan
jenis flocculant Powerfloc dengan dosis floocculant 45 gpt, persen solid 10% baik pada
GY 20% dan GY 40% dalam operasi pengolahan dan ekstraksi bijih emas di PT Nusa
Halmahera sehingga dapat lebih optimal.
Pada penelitian ini melakukan uji coba empat jenis flocculant. Variasi yang
digunakan yakni dosis flocculant sebesar 15 gpt, 30 gpt dan 45 gpt, lalu persen solid
dengan variasi 13% dan 15% serta blending ore dengan variasi GY 20% dan GY 40%.
Dilakukan optimasi sebanyak dua kali, untuk menganalisis pengaruhnya terhadap settling
rate, settling flux, turbidity dan percent solid final. Proses optimasi pertama dilakukan
dengan menggunakan flocculant terbaik dan adjust pH pada 10.10-10.50. Sedangkan
pada optimasi kedua dilakukan penurunan persen solid feed menjadi 10% solid. Proses
penelitian dilakukan selama dua jam tiap batch settling test dengan pengambilan data
setiap interval waktu.
Didapatkan jenis flocculant yang paling optimal pada blending ore GY 20% dan
GY 40% serta pada persen solid 13% dan 15% yakni Powerfloc. Dengan kecenderungan
GY 20% lebih mudah diendapkan daripada GY 40%. Sedangkan terkait dosis flocculant
yang mengalami peningkatan yang signifikan pada dosis flocculant 45 gpt. Berdasarkan
analisis keseluruhan hingga dua kali optimasi proses, didapatkan settling flux yang dapat
diaplikasikan di pabrik pada blending ore GY 20% sebesar 1.19 Ton/m2/h dengan
menggunakan Powerfloc pada dosis flocculant 45 gpt, persen solid feed maksimal 15%
dan adjust pH 10.10-10.50. Sedangkan GY 40% didapatkan settling flux sebesar 1.12
Ton/m2/h menggunakan Powerfloc pada dosis flocculant 45 gpt dan persen solid feed
maksimal 13% dan adjust pH 10.10-10.50.
Kata Kunci: Thickener, Flocculant, Settling Flux.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Thickener, Flocculant, Settling Flux. |
| Subjects: | T Technology > T Technology (General) |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eko Yuli |
| Date Deposited: | 02 Oct 2023 01:42 |
| Last Modified: | 02 Oct 2023 01:42 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/37754 |
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